Objective/Goal:
Your task is to investigate how factors, such as surface and weight, affect the size of frictional force.
Title:
Testing Frictional Force
Research Question/Problem:
How does the amount of friction affects the roughness of the surfaces and the force that takes the pull? *How does surface and weight affect the size of frictional force?
Hypothesis (part 1):
If the cork has the most friction, then it will take the most force because it has a rough surfaces. If the surface causes more friction then, the movement will require more force because the friction is the resistance of force. More friction, more force
Material:
Newton meter
Blocks
Data Table: 123Average
Carpet
4.0 Newton
3.8 Newton
4.5 Newton
4.1 Newton
Cork
10.0 Newton
9.0 Newton
9.8 Newton
9.6 Newton
Plastic
2.5 Newton
2.8 Newton
2.1 Newton
2.5 Newton
123Average
Carpet
2.3 Newton
2.0 Newton
2.1 Newton
2.13 N
Cork
4.5 Newton
4.9 Newton
5.3 Newton
4.9 Newton
Plastic
1.0 Newton
1.1 Newton
.9 Newton
1 Newton
Hypothesis (part 2):
If the mass increases then the force will also increase.
Cork
1,000 grams
10.0 Newton
50 grams
1.0 Newton
0
Newton
Cork
1,000 grams
5.5 Newton
500 grams
2.3 Newton
200 grams
1.3 Newton
Independent Variables:
Part 1: Cork, Carpet, Plastic (amount of friction)
Part 2: Force
Controlled Variables:
Part 1: Weight, speed, shape, spring scale
Part 2:
Dependent Variables:
Part 1: Force
Part 2: Mass
Procedure: Part I
1.Draw a Data Table to record the different types of surfaces to be tested and the force needed to pull the block at a constant speed.Note that this data table should be included under the Data and Calculation section.
2.Place _ grams in the box with the surface to be tested.
3.Attach your Newton meter to the block.
4.Using the Newton meter, try and pull the block along the surface.Note the force needed to pull the block at a constant speed and record in your Data Table.
5.Repeat steps 2-4 for the other different surfaces.
Part II
1.Draw a second Data Table to record the different weights to be tested and the force needed to pull the block at a constant speed. Note that this data table should be included under the Data and Calculation section.
2.Place _ grams on the block with the surface to be tested.
3.Attach your Newton meter to the block.
4. Using the Newton meter, try and pull the block along the surface.Note the force needed to pull the block at a constant speed and record in your second Data Table.
5.Repeat steps 2-4, placing different weights on the block.
6.Draw an x-y graph showing how the weight placed on the block affects the pulling force in Newton.Note that this graph should be included in the Results and Analysis section__.
Results and Analysis:
Answer the questions in complete sentences.
1.Explain what you have discovered about how different surface types affect the size of frictional forces. ·We discovered that in pulling objects in rough surfaces is harder and you will have to exert more force than the others. ·If the surface causes more friction then, the movement will require more force because the more friction, the more force you’ll need.
2.Use your results to explain, as an example, the best braking conditions for a car. ·Dry surface and more friction.
3.Explain how changing the weight on the block affected the size of the frictional forces. ·Because like of the block is heavier then we’ll need more force to pull it, if its lighter then, we won’t need that much force to pull it. ·Changing the weight on the block increases the size of frictional force.
4.What variable did you need to control in this experiment so that it was a fair test? ·For the first part the weight stayed the same. For the second part the surfaces stayed the same.
Conclusion:
How does surface and weight affect the size of frictional force? If the surface causes more friction then, the movement will require
more force because the friction is the resistance of force so I therefore conclude that the more friction the surface has then the more force you’ll need because friction is always against the direction of motion.
Your task is to investigate how factors, such as surface and weight, affect the size of frictional force.
Title:
Testing Frictional Force
Research Question/Problem:
How does the amount of friction affects the roughness of the surfaces and the force that takes the pull?
*How does surface and weight affect the size of frictional force?
Hypothesis (part 1):
If the cork has the most friction, then it will take the most force because it has a rough surfaces.
If the surface causes more friction then, the movement will require more force because the friction is the resistance of force.
More friction, more force
Material:
Newton meter
Blocks
Data Table:
1 2 3 Average
Hypothesis (part 2):
If the mass increases then the force will also increase.
Cork
Independent Variables:
Part 1: Cork, Carpet, Plastic (amount of friction)
Part 2: Force
Controlled Variables:
Part 1: Weight, speed, shape, spring scale
Part 2:
Dependent Variables:
Part 1: Force
Part 2: Mass
Procedure:
Part I
1. Draw a Data Table to record the different types of surfaces to be tested and the force needed to pull the block at a constant speed. Note that this data table should be included under the Data and Calculation section.
2. Place _ grams in the box with the surface to be tested.
3. Attach your Newton meter to the block.
4. Using the Newton meter, try and pull the block along the surface. Note the force needed to pull the block at a constant speed and record in your Data Table.
5. Repeat steps 2-4 for the other different surfaces.
Part II
1. Draw a second Data Table to record the different weights to be tested and the force needed to pull the block at a constant speed. Note that this data table should be included under the Data and Calculation section.
2. Place _ grams on the block with the surface to be tested.
3. Attach your Newton meter to the block.
4. Using the Newton meter, try and pull the block along the surface. Note the force needed to pull the block at a constant speed and record in your second Data Table.
5. Repeat steps 2-4, placing different weights on the block.
6. Draw an x-y graph showing how the weight placed on the block affects the pulling force in Newton. Note that this graph should be included in the Results and Analysis section__.
Results and Analysis:
Answer the questions in complete sentences.
1. Explain what you have discovered about how different surface types affect the size of frictional forces.
· We discovered that in pulling objects in rough surfaces is harder and you will have to exert more force than the others.
· If the surface causes more friction then, the movement will require more force because the more friction, the more force you’ll need.
2. Use your results to explain, as an example, the best braking conditions for a car.
· Dry surface and more friction.
3. Explain how changing the weight on the block affected the size of the frictional forces.
· Because like of the block is heavier then we’ll need more force to pull it, if its lighter then, we won’t need that much force to pull it.
· Changing the weight on the block increases the size of frictional force.
4. What variable did you need to control in this experiment so that it was a fair test?
· For the first part the weight stayed the same. For the second part the surfaces stayed the same.
Conclusion:
How does surface and weight affect the size of frictional force? If the surface causes more friction then, the movement will require
more force because the friction is the resistance of force so I therefore conclude that the more friction the surface has then the more force you’ll need because friction is always against the direction of motion.